Non-repetitive Frequency Modulation for Object Detection Accuracy
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Solution Overview
Problem
Existing distance measurement technologies face accuracy issues due to sub-peaks in the cross correlation function, especially in noisy environments, where the height of sub-peaks can be comparable to the main peak, leading to inaccurate object detection.
Innovation Solution
A signal processing apparatus generates a non-repetitive frequency-modulated wave for transmitting signals, allowing for accurate detection of object presence, distance, and speed by suppressing sub-peaks in the correlation function through continuous frequency change, thereby enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cyclic waveform is used for transmitting signal, then the signal can be transmitted repeatedly for measurement, but sub-peaks occur in the cross correlation function causing detection inaccuracy
Solution Approach 1:
The patent changes the frequency parameter of the transmitting signal from a cyclic pattern to a non-repetitive frequency modulation pattern. This parameter change eliminates the periodic correlation that causes sub-peaks in the cross correlation function, thereby improving measurement precision while maintaining signal transmission capability
Solution Approach 2:
The patent introduces asymmetric frequency modulation where the frequency changes in a non-repetitive manner rather than following a symmetric cyclic pattern. This asymmetry in the frequency trajectory prevents the formation of regular sub-peaks in the correlation function, resolving the contradiction between signal transmission and detection accuracy
2Ease of operation
If the main peak of the cross correlation function is used for detection, then distance measurement can be performed, but detection accuracy decreases due to sub-peaks in noisy environments
Solution Approach 1:
By changing the frequency modulation parameters of the transmitting signal to be non-repetitive, the patent suppresses the formation of sub-peaks in the cross correlation function. This allows the main peak to be clearly distinguished even in noisy environments, improving detection accuracy while maintaining the ease of distance measurement operation
Solution Approach 2:
The patent converts the harmful effect of frequency repetition into a benefit by deliberately designing a non-repetitive frequency modulation pattern. This transformation eliminates the harmful sub-peaks that would otherwise interfere with main peak detection, thereby improving measurement precision without complicating the operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses sub-peaks in the correlation function, ensuring high-accuracy object detection even in environments with ambient noise, by using a modulation wave with non-repetitive frequency changes, thus improving the reliability of distance and speed measurements.
Implementation Method 1
a receiving unit that receives a reflection signal generated when the transmitting signal is reflected by the object
Implementation Method 2
detecting at least one of presence of an object, distance to the object, and moving speed of the object, based on a correlation between a receiving signal and the transmitting signal
Data Source
AI summary
Provided is a technology which is able to detect an object with high accuracy. A signal processing apparatus 1 includes a generating unit 2 and a detecting unit 3. The generating unit 2 includes a function of generating, as a transmitting signal, a modulation wave whose frequency changes non-repetitively. The detecting unit 3 includes a function of fetching the transmitting signal and a receiving signal which is received by a receiving means that can receive a reflection signal generated when the transmitting signal is reflected by an object. The detecting unit 3 includes a function of detecting at least one of presence of the object, distance to the object, and moving speed of the object, based on correlation between the receiving signal and the transmitting signal.